“They may be small in size but they have big personalities and I think visitors will love their cheeky nature.

“It’s a real privilege to work with such beautiful and intelligent birds and training them for free flight is very rewarding.”

The boys are already beginning to practise short flying distances indoors, as well as entertaining staff with their first attempts at squawks – which are said to sound just like squeaky dog toys.

Sadly the new arrivals will not be on show for visitors for a few weeks.

Because they are very young they need more time to settle in, and they must also wait until the end of a required quarantine period.

But bosses at the centre are making sure their daily squawks and tweets are heard – appropriately enough via social networking site Twitter!

Heather said: “We will be posting photos and updates on their progress on our Facebook page and on Twitter until they finally go on show. And although full training does take a few months, visitors will be able to follow their progress because much of the training is done during displays, allowing the birds to get used to seeing a big audience.”

Ché and Esteban join free-flying Bonnie and Alfie, their larger green-winged macaw counterparts, at the centre on Woodsetts Road.

Current events at the centre include an exhibition called Whose Poo, which aims to dish the dirt on animal digestion.

Visitors are invited to take a daring look into the world of animal droppings until Sunday, September 4.